<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <title>Document</title>
    <link rel="stylesheet" href="./css/reset.css">
    <style>
        body{
            background-color: cornflowerblue;
        }
        .left-nav {
            width: 190px;
            height: 450px;
            padding: 10px 0;
            background-color: green;
            margin: 50px auto;
        }
        .left-nav .item{
            height: 25px;
            line-height: 25px;
            padding-left: 18px;
            
        }
        .left-nav .item:hover{
            background-color: grey;
            
        }
       .item a{
           color: blue;

       }
       .item a:hover{
           color: red;
           
       }
    </style>
</head>

<body>
    <nav class="left-nav">
        <div class="item">
            <a href="#">家用电器</a>
        </div>
        <div class="item">
            <a href="#">手机</a>/
            <a href="#">数码</a>/
            <a href="#">运营商</a>
        </div>

        <div class="item">
            <a href="#">洗衣机</a>/
            <a href="#">笔记本</a>/
            <a href="#">显卡</a>
        </div>

        <div class="item">
            <a href="#">电视</a>/
            <a href="#">吹风机</a>/
            <a href="#">书</a>
        </div>
        <div class="item">
            <a href="#">电视</a>/
            <a href="#">吹风机</a>/
            <a href="#">书</a>
        </div>
        <div class="item">
            <a href="#">电视</a>/
            <a href="#">吹风机</a>/
            <a href="#">书</a>
        </div>
        <div class="item">
            <a href="#">电视</a>/
            <a href="#">吹风机</a>/
            <a href="#">书</a>
        </div>
        <div class="item">
            <a href="#">电视</a>/
            <a href="#">吹风机</a>/
            <a href="#">书</a>
        </div>
        <div class="item">
            <a href="#">电视</a>/
            <a href="#">吹风机</a>/
            <a href="#">书</a>
        </div>
        <div class="item">
            <a href="#">电视</a>/
            <a href="#">吹风机</a>/
            <a href="#">书</a>
        </div>
        <div class="item">
            <a href="#">电视</a>/
            <a href="#">吹风机</a>/
            <a href="#">书</a>
        </div>
        <div class="item">
            <a href="#">电视</a>/
            <a href="#">吹风机</a>/
            <a href="#">书</a>
        </div>
        <div class="item">
            <a href="#">电视</a>/
            <a href="#">吹风机</a>/
            <a href="#">书</a>
        </div>
        <div class="item">
            <a href="#">电视</a>/
            <a href="#">吹风机</a>/
            <a href="#">书</a>
        </div>
        <div class="item">
            <a href="#">电视</a>/
            <a href="#">吹风机</a>/
            <a href="#">书</a>
        </div>
        <div class="item">
            <a href="#">电视</a>/
            <a href="#">吹风机</a>/
            <a href="#">书</a>
        </div>
        <div class="item">
            <a href="#">电视</a>/
            <a href="#">吹风机</a>/
            <a href="#">书</a>
        </div>
        <div class="item">
            <a href="#">艺术</a>
        </div>

    </nav>
</body>

</html>